CPO3 Code Practice Oscillator Kit

SORTING PARTS AND GETTING READY! Prepare a clear, uncluttered workspace. In addition to room needed for tools and handling the circuit board, allow space for some kind of “parts organizer” that will not be bumped or dropped. This organizer can be a small tray or box. (An egg crate works great!) Refer to the Parts List published in the kit manual. Organize the kit parts according to basic types. Check carefully to make sure a small part did not slip away when opening the kit's packaging. Please make sure that you have sufficient lighting for clear parts identification and accurate circuit soldering. This might seem like gratuitous advice that you did not ask for, but experience has shown that brown, orange, red and silver resistor colors and tiny numbers on capacitors and transistors all start to look the same in dim light after a hard day's work! IDENTIFYING KIT PARTS CERAMIC DISC CAPACITORS It is helpful practice to become as familiar as possible with the various marking codes for ceramic capacitors. The first fact to keep in mind is that there are several accepted methods for marking the value of these capacitors! While resistor color codes have withstood changing times over many decades, the protocols for marking evermore tiny capacitors have many variations! While capacitors also can be color-coded, Ramsey Kits use disc capacitors marked by a number/letter code. The first two digits establish the first two numbers of the value. The third digit is the multiplier. The letter designates the manufacturing 'tolerance"or accuracy for the value printed. Values under 100 picofarads, used widely in our FM and VHF kits, are printed clearly with no need to interpret them further. Small capacitors stamped 4.7, 10, 15, 33, 68 and so forth are 4.7, 10, 15, 33, 68 picofarads respectively! A 100 picofarad capacitor, also commonly used in our kits, can be marked either 100 or 101! If it's marked 100, believe it. If it is marked 101, the value is 10 (first 2 digits) X 10 (3rd digit multiplier) = 100 picofarads! If it is marked 101J, we know that it is made to 5% accuracy, while H signifies 3% and K is 10%. Rule of thumb: If the 3rd digit is a 0, you may assume the value is in picofarads, and you can take the three numbers together as the picofarad value for that capacitor. So, just as in the above example, both “470” and “471” are 470 pf. Ramsey Customer Use Only Not For Publication

CPO3  7

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